How does the Doppler effect explain the sound you hear when a race car comes toward and then passes a camera?

Answers

Answer 1

Answer:

The pitch is higher as it approaches and then becomes lower the moment it passes.

Answer 2

Answer: when an object is moving the waves in front of it (sound, light, whatever) get compressed and the waves behind it are stretched apart. so in a race cars case, the compressed waves make a higher pitched noise and vice versa

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a moving company is called into a building and asked to relocate 520 bricks to a location 15 meters above the ground if each brick is 4 kilograms what amount of work will be needed to accomplish the task

Answers

Wow ! I'm sweating just thinking about it.

The amount of work required is the additional potential energy

that the bricks will have when they're all up at the higher location.

Increase of potential energy = (mass) x (gravity) x (increase in height)

The total mass is (520 bricks) x (4 kg/brick) = 2,080 kilograms

Potential energy = (2,080 kg) x (9.8 m/s²) x (15 m)

Potential energy = 305,760 Joules.

Grab your hat, put on your sunscreen, and get busy.

Answer:

Work done to lift one brick = 4 Kg x 9.8 m/sec 2 x 15 m = 588 Joules. Then work done to lift 520 bricks = 520 x 588 = 305.760 j

True or False Another name for constructive interference is intense interference

Answers

The answer to this statement is FALSE

The main reason ice blocks became unpopular for cooling food was

Answers

The source of the ice was unsanitary

Answer:

The source of ice was unsanitary :>

Explanation:

Lighting a match results in light and heat. Since energy was not created by the match, what transformation took place?

Answers

Chemical energy stored in the compounds caked on the head of the match, and later the
chemical energy stored in the wood, was released in the form of heat and light when the
chemical compounds got hot enough.

The sun is its highest in the sky during what season

Answers

*olaf voice*

IN SUMMMMMMERRRRRRR

The sun is at its highest in the sky during Summer

An explosion occurs 340 km away. Given that sound travels at 340 m/s, the time the sound takes to reach you is a. 1 s.
b. 10 s.
c. 100 s.
d. 200 s.
e. more than 200 s.

Answers

(340,000 meters) / (340 meters/sec) = 1,000 seconds

That's more than 200 sec.

first convert 340km into 340,000m, and 340000/340=1000. So the answer is e.

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